Drilling mechanism



April 28, 1931..

E. G. GARTIN DRILLING MECHANISM Filed March 24, 1927 6% a w A A m w\ m x w ms Q G w waw @m. K Q NW whm Ex ww Q t wm o WNMM. llil llHnhv 3 Hum; 5 .kN

Patented Apr. 28,1931

sr'rss ELMEB, G. GAR'IIN, OF CLAREMONT, ,N W HAIEIPSHIRE, ASSIGNOR TO SULLIVAN MA- CHINERY COMPANY, A CORPORATION OF MASSACHUSETTS I DRILLING MECHANISM Application filed March 24, 1927. Serial No. 178,109.

This invention relates to drilling mechanisms and more partlcularly appertams to rock drilling mechanisms of the pressure fluid actuated hammer type.

An object of this invention is to provide an improved rock drill. Another object is to provide an improved rock drill having an improved and simplified supporting means for the cleansing fluid conducting tube and 110 for a. rotatable element of the drill steel rottion mechanism, said supporting means cooperating with the rear motor head to form a lubricant reservoir. Another object is to provide an improved supplemental head member clamped between the rear motor head and the ratchet ring of the rotation mechanism and having a central boss projecting through the back head for supporting the cleansing fluid supply tube,the pawl carrier of the rotation mechanism being journaled in said supplemental head. Another object is to provide an improved structure exceedingly rugged and compact and which may be manufactured at a minimumof expense. These and other objects will, however, hereinafter more fully appear.

In the accompanying drawing I have shown for purposes of illustration. one form which the invention may assume in practice.

In this drawing, c

Fig. 1 is a central longitudinally extending vertical sectional view through a rock drill embodying the improved construction. parts being shown in elevation to simplify illustration.

Fig. 2 is a rear end elevational view of the rock drill shown inFig. 1.

In this illustrative embodiment of they invention there is shown a rock drill generally designated 1 of the pressure fluid actuated,

hammer type and comprising a cylinder 2 having a bore 3 in which a hammer piston at is reciprocably mounted. The hammer pis ton 4. is provided with a forwardly project- 77 ing striking bar 5 extending through a centra l bore 6 formed within afront buffer ring or head member 7 As the piston 4 is reciprocated within the bore 3 under the action of pressure fluid admitted to the cylinder under the control of a usual automatic valve wvard end of the drill;

perforated disc or washer 10 seated within a I counterbore 11 formed within the rear end of the cylinder. The washer 10 is also seated in a 'counterbore 12 formed withinia rearwardly located ratchet ring 13. In accordance with this illustrative embodiment of the invention there'isshown interposed between the ratchet ring 13 and a, rear head let a supplemental headmember 15 havin projecting cylindrical portions 16 and 17 formed on its opposite faces and respectively projecting within suitable bores formed within the back head and ratchet ring as clearly shown in Fig. 1. The member 15 has formed integral therewith a central boss .18 projecting rearwardly therefrom through an'opening 19 formed centrally within the rear head 14. The boss 18 projects beyond the head 14L and is externally threaded at 19a to receive a nut 20. It is obvious that when the nut 20 is suitably tightened, the head member 15 and rear head 14 are rigidly clamped together andwhen positioned in this manner the heads cooperate to form a lubricant reservoir 21. The rear head 14 carries a usual throttle valve mechanism 22 which is adapted to control the flow of pressure fluid from a suitable supply connection 23 to the'autd niatic valve mechanism 8 in a well known manner.

In this instance the ratchet ring 13 has housed therein a pawlcarrier 24 which carries a plurality of springpressed pawls which cooperate with internal teeth 25 within the ratchet ring 13 in a well known manner. 3 As shown, the pawl carrier has projecting from the rear surface thereof a' cylindrical bearing portion 26-which is rotatably mounted within a bore 27 formedwithin the supplemental head member 15. The, pawl carrier24 also has vprojecting forwardly therefrom a spirally grooved rotation bar 28, the spiral lac end of the piston 4:. The striking bar 5 of the piston has formed on the periphery thereof longitudinally extending straight grooves or flutes 81 which cooperate with straight vanes formed on a chuck nut threadedly connected at 34: within a chuck sleeve 35. T he chuck sleeve 35 is rotatably mounted within a chuck housing 36 and herein carries a chuck bushing 37 within which the drill steel 9 s mounted. The chuck housing 36, the buffer ring 7, the cylinder 2, the ratchet ring 13, supplemental head 15 and rear head ll are held in operative assembled relation by means of usual side bolts 38. It is accordingly evident that as the piston l moves forwardly within the cvlinder bore 3, the spiral grooves on the rot ion nut 29 which cooperate with the spirally grooved rotationbar eifect rotation of the latter, the pawls slipping over the ratchet teeth 25 and the piston striking an unimpeded blow on the shank of the drill steel 9. Upon reversal of the hammer piston the pawlsof the ratchet mechanism engage the ratchet teeth 25 and consequently rotation of the bar 28 is prevented. It is accordingly evident that as the piston moves rearwardly, the spiral grooves on the then stationary rota"*on bar impart a turning movement to the piston which is transmitted by the grooves in the striking bar, the chuck nut 33, the chuck sleeve 85, the chuck bushing 37 to the drill steel 9. It is therefore evident that the drill steel is given a slight turning movement upon each reciprocation of the hammer p' ton.

' In this improved construction it will be observed that the boss 18 on the supplemental head 15 is centrally bored at 39, the rotation bar 28 is centrally bored at 4-0, and the striking bar 5 centrally bored at 41 and extending through these bores forwardly within the hollow drill steel 9 is a cleansing fluid conducting tube 4:2, the tube extending rearwardly beyond the boss 18 and having formed on its rear end a radial flange 13. As shown, surrounding the rear end of the tube 42 and disposed within a bore ll within the rear end of the central boss 18 is a compressible packing washer 45, the nut 20 when tightened clamping the flange l3 of the cleansing'tube between the nut and the washer 45, compressing the latter, thereby preventing leakage of fluid past the packing and through the bore 89 to the rotation parts. Water under pressure is adapted to besupplied to the cleansing tube 42 through a port 4L6 formed in the rear head 14 and communicating through a passage 4:7 in the nut 20 withthe tube. ,iWhen the throttle valve mechanism 18 suitably manipulated, pressure is supplied to the automatic valve mechanism 8 and suitably. distributed to the cylinder bore to effect reciprocation of the piston in the usual manner. Simultaneously, pressure flu d 1s admitted from the cylinder bore through suitable restricted passages 48 in the washer 10 to the pressure within the rear end of the cylinder bore, to the parts of the rotation mechanism and thence to the motor. From the foregoing, it is thought that the construction, oper ation, andmany advanlagcslof the herein described invention Will be apparent to those skilled in this art, without further description.

As a result of this invention it will be noted that an improved supporting structure is provided for the water tube and this supporting structure also forms a support within which the pawl carrier of the rotation mechanism is jonrnaled. It will also be noted that the improved supplemental heal structure coop-erates in an improved manner with the rear head to form a lubricant reservoir, the lubricant being transmitted through a supplemental head to the rotation parts and the motor cylinder. Furthermore the improved water tube support and securing means are readily accessible, it being possible to remove the water tube by simply unthreading the nut and withdrawing the tube longitudinally from the machine, thereby permitting expeditious; and facile replacement of the latter. These andotheradvantages of the improved construction will be. readily 'apparent to those skilled in this art.

While I have in this application specifically described one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in various other forms without departing from its spirit or the scope of the appended claims.

l Vhat I claim as new and desire to secure by Letters Patent'is: v

1. In a drilling mechanism, a motor comprising a. cylinder and a piston reciprocable therein, a rear head for said cylinder having central bore and arecess, a cooperating supplemental head having a central rearwardly projecting boss extending through said bore, said latter head also having a recess, means connectible to said boss for clampmg said heads directly together with the recesses in said heads cooperating to form a lubricant reservoir, and means for securing smd heads to said cylinder.

In a drilling mechanism, a motor comprising a cylinder and piston reciprocable therein, a rear head having a central bore therein, a cooperating intermediate head between the cylinder and said rear head and having a central boss projecting 'rearwardly through said bore, said heads having cooperating means forming an annular fluid containing chamber therebetween from which fluid is supplied to parts of the motor, means connectible to said boss and engaging said rear head for clamping said heads directly together, and means for securing said heads to the cylinder. 3

3. In a drilling mechanism, the combination specified in claim 2 wherein there is further provided a cleansing fluid tube extending centrally through the motor and loncooperating annular recesses forming an an-,

nular fluid containing chamber between the heads from Which fluid is supplied to parts of the motor, a cleansing fluid tube extending through and supported by said boss, a cap threaded on the end of said boss and engaging said rear head for clamping the heads directly together, means provided by said cap for holding said cleansing fluid tube in position, and means forsecuring said heads to said cylinder.

5. In a drilling mechanism, a motor comprising a cylinder and a piston, a rear head for said cylinder having a central bore, a 00- operating supplemental head having a central rearwardlyprojectingboss extending into said bore, said heads having cooperating means forming a lubricant reservoir, means connect-ible to said boss and engaging said supplemental head for securing said heads directly together, and means for securing said heads to said motor cylinder.

In testimony whereof I afilx my signature.

ELMER G. GARTIN. 

